What Does IP Rating Mean?
IP (Ingress Protection) rating is defined by international standard IEC 60529 and describes how well an electrical enclosure is protected against solid particles (dust) and liquids (water). Every luminaire intended for outdoor or wet/dusty environments should carry an appropriate IP rating.
Understanding the Two Digits
An IP rating consists of two digits: the first describes protection against solids, the second against liquids.
First Digit — Solid Particle Protection
| Rating | Protection Level |
|---|---|
| IP 4X | Protected against solid objects >1mm (tools, wires) |
| IP 5X | Dust protected (limited ingress, no harmful deposit) |
| IP 6X | Dust tight (complete protection against dust) |
Second Digit — Liquid Protection
| Rating | Protection Level |
|---|---|
| IPX3 | Protected against spraying water (up to 60° from vertical) |
| IPX4 | Protected against splashing water from any direction |
| IPX5 | Protected against water jets |
| IPX6 | Protected against powerful water jets |
| IPX7 | Protected against temporary immersion (up to 1m, 30 min) |
| IPX8 | Protected against continuous immersion (depth specified by manufacturer) |
Which IP Rating for Which Application?
| Application | Recommended IP | Reason |
|---|---|---|
| Indoor office / retail | IP20–40 | Dry environment, no water exposure |
| Bathroom / kitchen | IP44–54 | Splash protection required |
| Car park (covered) | IP54–65 | Dust and occasional water jets |
| Outdoor street / area | IP65–66 | Full dust protection + water jets |
| Industrial wash-down | IP66–69K | High-pressure cleaning |
| Underwater / fountains | IP67–68 | Submersion protection |
IK Rating: Impact Protection
In addition to IP rating, luminaires in high-traffic or vandal-prone areas should also carry an IK rating (IEC 62262), which measures resistance to mechanical impact. IK08 (5 joules) is suitable for most public spaces; IK10 (20 joules) is recommended for high-risk environments.